Joystick for controlling an aircraft

1. A joystick for controlling an aircraft, comprising:

a frame,

a lever,

a mechanical linking assembly of the lever to the frame enabling rotation of the lever relative to the frame according to a first axis of rotation,

wherein the mechanical linking assembly comprises a first pivot joint, the first pivot joint comprising a first part, a second part mounted mobile relative to the first part, and at least two flexible blades, each flexible blade having an end fixed to the first part and another end fixed to the second part and being resiliently deformable to enable rotation of the second part relative to the first part according to the first axis of rotation and generate a return torque tending to oppose rotation of the second part relative to the first part.

2. The joystick according to claim 1 , wherein the second part of the first pivot joint is mobile in rotation relative to the first part of the first pivot joint from a rest position according to a first direction of rotation only, and wherein the first pivot joint comprises a first stop arranged to prohibit travel of the second part in a second direction opposite the first direction.

3. The joystick according to claim 2 , wherein the mechanical linking assembly comprises a first set of pivot joints including the first pivot joint and a second pivot joint the second pivot joint comprising a third part and a fourth part mounted mobile in rotation relative to the third part from a rest position according to the second direction of rotation only, and wherein the second pivot joint comprises a second stop arranged to prohibit travel of the fourth part in the first direction opposite the second direction.

4. The joystick according to claim 2 , wherein the second part abuts against the first stop when the first pivot joint is in the rest position, and the blades of the first pivot joint are flexed and exert non-zero return torque on the second part of the first pivot joint.

5. The joystick according to claim 4 , wherein the first stop is configured to be adjustable in position so as to enable adjusting the non-zero return torque.

6. The joystick according to claim 1 , further comprising a first couple of blades, and a second couple of blades, said first couple and said second couple including said at least two flexible blades, wherein the first pivot joint comprises said first couple of blades and said second couple of blades, each couple of blades generating a return torque according to the first axis of rotation.

7. The joystick according to claim 6 , wherein the first couple of blades and the second couple of blades are arranged symmetrically relative to each other.

8. The joystick according to claim 1 wherein the first pivot joint further comprises an elastic element connecting the first part and the second part, and the elastic element is in traction between the first part and the second part, the elastic element for generating a return force to cause rotation of the second part relative to the first part.

9. The joystick according to claim 1 , wherein the mechanical linking assembly comprises a first chain of pivot joints, including the first pivot joint and a second pivot joint mounted in series with the first pivot joint,

wherein the first part of the first pivot joint is mounted integral with the second part of the second pivot joint, or

the second part of the first pivot joint is mounted integral with the first part of the second pivot joint.

10. The joystick according to claim 9 , wherein the first pivot joint comprises a first stop configured to limit travel of the second part of the first pivot joint in a first direction of rotation, and the second pivot joint comprises a second stop configured to limit travel of the third part of the second pivot joint in the first direction of rotation.

11. The joystick according to claim 10 , wherein the first stop and/or the second stop is adjustable in position so as to enable adjusting the travel from which the first pivot joint and/or the second pivot joint is stopped.

12. The joystick according to claim 1 , wherein the mechanical linking assembly comprises a strain or deformation sensor mounted on one of the blades, the blade serving as test body for the sensor.

13. The joystick according to claim 1 wherein the mechanical linking assembly enables rotation of the lever relative to the frame according to a second axis of rotation, perpendicular to the first axis of rotation, and wherein the mechanical linking assembly comprises a second pivot joint, the second pivot joint comprising a third part, a fourth part mounted mobile relative to the second part, and at least two flexible blades, each flexible blade connecting the third part and the fourth part together and being resiliently deformable to enable rotation of the fourth part relative to the second part according to the second axis of rotation and generate return torque tending to oppose rotation of the fourth part relative to the second part.

14. The joystick according to claim 13 , wherein the mechanical linking assembly comprises a second chain of pivot joints, including the second pivot joint and a third pivot joint mounted in series with the second pivot joint,

wherein the first part of the second pivot joint is mounted integral with the second part of the third pivot joint, or

the second part of the second pivot joint is mounted integral with the first part of the third pivot joint.